Pearl Izumi P.R.O. Thermal Bib Cycling Shorts. Take the chill out of cool weather rides with the Pearl Izumi P.R.O. Thermal Bib Cycling Shorts. The thermal fleece fabric not only features a brushed interior to retain heat, but it also wicks moisture like a fiend to keep you dry and comfortable critical when the weather is in the realm of brisk or bitter cold. The P.R.O Anatomic 1:1 chamois delivers exemplary comfort for your racing or training needs while flatlock seams make sure nothing rubs you the wrong way. These thermal bib Cycling Shorts provide incredible flexibility as you can pair them with knee warmers or leg warmers depending on temperature, or opt for embrocation instead on the legs as you embrace your inner Belgian for cyclocross racing or cold weather road racing.